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Vim mappings for the win

I mostly work in source code hierarchies where for a given source file X.source the location of the file with the unit tests is tests/test_X.source and more often than not I need to do edit the unit tests after having opened the actual source file.

Being the geek that I am I *obviously* need to come up with some sort of optimisation or shortcut even if it takes 10x as long as stupidly typing in ":e tests/test_X.source" all the time :-)

Thankfully, the solution in vim turns out to be quite straightforward. The following mapping (conveniently added to your $HOME/.vimrc file) will open the unit test file when you type %%